﻿#region Copyright Simple Injector Contributors
/* The Simple Injector is an easy-to-use Inversion of Control library for .NET
 * 
 * Copyright (c) 2014-2015 Simple Injector Contributors
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
 * associated documentation files (the "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
 * copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
 * following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial 
 * portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#endregion

namespace SimpleInjector.Integration.WebApi
{
    using System;
    using System.Collections.Concurrent;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web.Http;
    using System.Web.Http.Controllers;
    using System.Web.Http.Filters;

    internal sealed class SimpleInjectorActionDescriptorFilterProvider : IFilterProvider
    {
        private readonly ActionDescriptorFilterProvider baseProvider = new ActionDescriptorFilterProvider();
        private readonly ConcurrentDictionary<Type, Registration> registrations =
            new ConcurrentDictionary<Type, Registration>();

        private readonly Func<Type, Registration> registrationFactory;

        internal SimpleInjectorActionDescriptorFilterProvider(Container container)
        {
            this.registrationFactory =
                concreteType => Lifestyle.Singleton.CreateRegistration(concreteType, container);
        }

        public IEnumerable<FilterInfo> GetFilters(HttpConfiguration configuration, 
            HttpActionDescriptor actionDescriptor)
        {
            FilterInfo[] filters = this.baseProvider.GetFilters(configuration, actionDescriptor).ToArray();

            foreach (var filter in filters)
            {
                this.InitializeFilter(filter.Instance);
            }

            return filters;
        }

        internal void InitializeFilter(IFilter instance)
        {
            Registration registration =
                this.registrations.GetOrAdd(instance.GetType(), this.registrationFactory);

            registration.InitializeInstance(instance);
        }
    }
}